Alright i got my 300ex going a running good finally and i figured i would have to rejet so my brother had the stock jet out of his 400ex a 148 so just for kicks i put it in just to see how far off it would be. I did a plug check and its not far off. I have good throttle response good when i really rip on it but when im just running around the yard not putting but not hammering on it like in the mid it kinda falls on its face for a split second. I just installed a new clutch so its not that. Its gotta be my jetting im running a 40 or 42 pilot 148 main and my needle is at stock setting right in the middle. Any help is greatly appreciated.